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@niithtat stent @fitta AND EDWARD B. HOWE, OE SAME PLACE. Laim Para@ No. 63,920, @madam 16,1867.

IMPROVED VENTILATING BUNG FOR OASKS, 6to.

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TOV ALL WHOM IT MAY CONCERN:

Bc it known that I, JEROME B. MELVIN, of Lowell, in the county of Middlesex,and State of Massachusetts, have invented a new and useful Improvement in Bangs .or Vent-Plugs, to be used in casks or reservoirs con-1 taining liquids, where vent is required; and I do hereby declare the same to be fully described in the following specification, and represented in the accompanying drawings, of which- Figure 1 is a top view of one of my improved bungs or vent-plugs, after the plug C has been. removed.

Figure 2 is the same, with the plug (lscrewed in.

Figure 3 is a longitudinal section of g. l, and has a screw cut the whole length of it, which screws into the cask or reservoir in a hole made to receive it.

Figure 4 is a longitudinal section of lig. '2, having straight sides, and slightly tapering, to drive into a hole in the cask or reservoir Figure 5 is a bottom view of the valve B in fig. l.

Similar letters of reference indicate corresponding parts in all the figures.

y invention .consists of a bung or vent-plug, composed of metal, wood, or other suitable material, when the said bung or vent-plug isprovided with a valve resting on a sharp-edged annular seat, and a vent-passage communicating from without with a cavity below the valve, also a pressure-passage communicating from within the cask or reservoir with a pressure-chamber above the valve.

In the drawings, A A is the bung or veut-plug, provided with a valve, B, resting on a sharp-edged annular seat, o o; the vent-passage e communicates from without with a cavity, I, made in the substance of the bung or vent-plug A A, belowthe valve B; the pressure-passagcf communicates from within the cash or reservoir with the -pressure-chamber H, above the valve B; the plug C, which is screwed into the top of the bung or vent-plug A A, is concave at the under side, and forms the top-of the pressure-chamber II, all as clearly shown in figs. 3 and 4. The valve B, in fig. 4, is a round ball, and rests upon a-sharp-edgcd annular seat, o o, like thatin Viig. 3; said ball may be made of rubber, or any other elastic substance. 4

The object of my invention may be easily seen. When the liquid in the cask or reservoir is being drawn out, atmosphere passes in through the vent-passage e into and through the cavity I )Vith sufficient force to lift the valve B, passing the saidlifted valve into the pressure-chamber I-I, and through the pressurc-passagefinto the cask orTeservoir, thus giving free vent to the same and allowing the liquid to run out, and when the liquid ceases tovrun, the valve falls back onto the seat o o by its ow'n weight. The pressure from within the cask or reservoir acts upon the top ci the valve B, through -the pressure-passage into the pressure-chamber II, thus holding the valve B down on to the sharp-edged annular seat o o, and therebypreventing evaporatiomor the escapek of any liquid through thc said improved bung or vent-plug. When my improved bung or vent-plug is made to screw into the cask or reservoir, a thread is cut the vwhole length of it, as shown in iig. 3, and by inserting a- 'forked wrench in holes gg, tig. 1, the Ibung or vent-plug A A is screwed into the ,cask or reservoir, in a hole'v made to receive it.

I am aware that a metallic'bung, havinga knife-like threaded screw to screw into the cask, was patented.V by 'I.B. Smith, July 19, 1859, and that a bung having a reservoir for spirit, combined with a system ofpipes; or passages, and a peculiar valve, was patented by John Keane, September 27, 1859; also that Va valve-bung,

of peculiar construction was patented by Florian Dabis, February 8,1859; and therefore I wish it to be understood that I disclaim having invented the equivalent in principle or action of either of the said bungs.

But what I vdo claim as new, and desire to secure by Letters Patent, is

I claim the combination of the ventpassage e, the cavity I, the valve B, its seat o o, the pressure-chamber H, and pressure-passage with-the bung or vent-plug A A, the whole arranged substantially as herein set forth and shown, for the purpose specified. i

JEROME Br-MELVIN.

Witnesses:

Jenn E. CRANE, J. S. Wni'rnsv. 

